Yamaha VMX12H Supplementary Service Manual page 337

LI G HTI NG SYSTEM
H eadl i ght Troubl eshoot i ng
R epl ace.
Repl ace.
Check m ai n swi t ch, r epl ace i f necessar y.
C heck " STAR T" sw i t ch, i f necessar y.
n open or poor co
Poor gr ound or poor connect i on of head-
l i ght w i r i ng.